How to use Remove Duplicate Lines
- Paste your list (one item per line).
- Remove duplicates.
- Optionally sort the cleaned list.
- Copy the result.
Worked examples
Concrete numbers and cases you can check against the tool above.
RSVP emails pasted from three sheets
If 180 lines contain 22 repeats, unique + optional sort yields 158 addresses. Compare counts before and after so you know how many collisions you removed. This is line-based: “Pat@example.com” and “pat@example.com” are different unless you lowercase first.
When to use Remove Duplicate Lines
Exports, RSVP lists, and scraped columns accumulate duplicate lines. Cleaning them in the browser is safer than uploading customer lists to unknown sites.
Common use cases
- Deduplicate an email list before a campaign send.
- Clean repeated SKUs from a spreadsheet export.
- Unique a classroom roster after merging sections.
- Sort and dedupe a brainstorm list of domain ideas.
Inputs and outputs
- Plain text lists (one entry per line)
Privacy
This tool runs entirely in your browser. Your data never leaves your device — nothing is uploaded to our servers.
Frequently asked questions
- Is matching case-sensitive?
- Duplicate detection follows the tool’s matching rules — identical lines are removed; slight spelling differences are kept.
- Does order stay the same?
- Typically the first occurrence is kept. Sorting is optional if you enable it.
- Is my list private?
- Yes. Processing stays in your browser.